Super Mario Emulator is one of the most meaningless romhacks I've ever played; if you see the level design itself, you'll notice that it's very lacking, repetitive and consists mostly of JOE (Jump Over Everything), as opposed to being very varied.
Also, most levels average a 10-minute length, so it's more of the case that the hack is huge overall for the suggested length of 26 exits(?), which does not go well with the weak level design.
I also found the bug in which the player couldn't continue past "Ruinas do templo": Both levels were set to use event 37; this event was already fired off earlier, meaning that using it again would unlock nothing. An updated version with the fix will likely be resubmitted once I'm finished.